Mallard (Ducks, Wild Duck)
Kingdom: Animalia; Phylum: Chordata; Class: Aves; Order: Anseriformes; Family: Anatidae; Genus: Anas; Species: Anas platyrhynchos · Anatidae (Ducks, Geese, and Swans) · Secondary Flight Feather (Speculum feather)
Species
Anas platyrhynchos
Feather Type
Secondary Flight Feather (Speculum feather)
Family
Anatidae (Ducks, Geese, and Swans)
Shape
Broad and somewhat rectangular with a rounded to slightly blunt tip; asymmetrical vanes typical of a secondary flight feather.
Size
Approximately 7-10 cm (2.8-4 inches) in length. This is consistent with the secondary feathers found in the speculum of an adult Mallard.
Rarity
Very Common; it is perhaps the most abundant and recognizable duck species in the world.
Color & Pattern
Striking iridescent emerald green to indigo blue on the outer vane, bordered by a thick velvet-black band and tipped with a crisp white terminal bar. The inner vane and base are typically brownish-gray.
Barb Structure
The distal portion is highly specialized and pennaceous with tightly interlocked barbs to create the flat, iridescent surface. The proximal (base) area is plumulaceous (downy).
Texture & Surface
The iridescent section is very smooth, stiff, and glossy/metallic. The white tip is matte. The overall feather is somewhat waxy and water-resistant, reflecting the bird's aquatic lifestyle.
Description
The Mallard is a large dabbling duck. Males (drakes) are famous for their iridescent green heads, yellow bills, and curled black tail feathers, while females (hens) are mottled brown with a dark eye-stripe. Both sexes possess this brilliant iridescent blue-green speculum feather on the wing, which acts as a visual signal during flight and social displays.
Key Features
The distinctive 'sandwich' of colors: iridescent green/blue, followed by a black band, ending in a white tip. No other common duck has this exact color combination on a secondary feather of this size.
Habitat
Extremely versatile: found in wetlands, lakes, ponds, rivers, marshes, estuaries, and frequently in urban parks or suburban storm-water basins.
Geographic Range
Widespread across the Northern Hemisphere; found throughout North America, Europe, and Asia. Introduced and established in Australia, New Zealand, and South America.
Condition Notes
Good; showing some slight separation of the barbs at the tip (fraying), likely due to natural wear or being tossed by water before being found.
Interesting Facts
The iridescent color is 'structural'—it isn't caused by pigment but by the microscopic structure of the feather refracting light like a prism. Mallards are the ancestors of almost all domestic duck breeds.
Ecological Role
Omnivorous dabbler; they play a key role in seed dispersal for aquatic plants and serve as a food source for numerous predators, including hawks and foxes.
Similar Species
American Black Duck (similar speculum but lacks the broad white borders), Northern Shoveler (speculum is green but the wing coverts are blue), and Gadwall (speculum is white and black).
Notes
On the water